... -pressure sensors main function: to check air filter in the debris, check air filter external pressure differential value to ensure unit normal operation3 ... maximum is less than 0.05 Pa, Otherwise the air filter dif-pressure sensor is bad, need to change it.4 ... us for refercence, we also supply all all kinds air filter, oil filter, oil separator replacement for Atlas Copco, Ingersollrand,Sullair,Fusheng ...